diff --git a/flatland/utils/rendertools.py b/flatland/utils/rendertools.py
index dd49fb54f6cef27748f8936972bbbd7a8136d004..00fde0246ed937dcf97f44dd63067060b7c54350 100644
--- a/flatland/utils/rendertools.py
+++ b/flatland/utils/rendertools.py
@@ -68,9 +68,7 @@ class RenderTool(object):
             tbTrans = rt.RETrans.get_transitions(oTrans, visit.iDir)
             giTrans = np.where(tbTrans)[0]  # RC list of transitions
             gTransRCAg = rt.gTransRC[giTrans]
-            self.plotTrans(
-                visit.rc, gTransRCAg,
-                depth=str(visit.iDepth), color=color)
+            self.plotTrans(visit.rc, gTransRCAg, depth=str(visit.iDepth), color=color)
 
     def plotAgents(self):
         rt = self.__class__
diff --git a/tox.ini b/tox.ini
index 331109ee7f80c869fb9640c9f4f17e26a11c2add..c8e28dd38c145803acfa4a5272ac7f7da9fbbf89 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,6 +6,9 @@ python =
     3.7: py37
     3.6: py36
 
+[flake8]
+max-line-length = 120
+
 [testenv:flake8]
 basepython = python
 deps = flake8